code: def __getitem__(self, idx):
      assert np.max(idx) < self._capacity
      assert 0 <= np.min(idx)
      return self._value[self._capacity + idx]
  
file_path: stable-baselines/stable_baselines/common/segment_tree.py
imports: import numpy
label_desc: Use image node_id 5 for calling the SegmentTree obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: self